class Animal15{
    public void shout(){
        System.out.println("喵喵喵········");
    }
}
class Dog15 extends Animal15{
    public void shout(){
        System.out.println("汪汪汪········");
    }
    public void eat(){
        System.out.println("吃骨头·······");
    }
}

public class Example15 {
    public static void main(String[] args) {
        Dog15 dog = new Dog15();
        Animal15 a1 = dog;
        a1.shout();
//        a1.eat(); Animal没有eat方法 所以eat无法使用
    }
}
